package ch.qos.logback.core.util;
   
   import java.util.List;
   
   import org.junit.jupiter.api.AfterEach;
   import org.junit.jupiter.api.BeforeEach;
   
   import ch.qos.logback.core.Context;
   import ch.qos.logback.core.ContextBase;
  import ch.qos.logback.core.status.OnConsoleStatusListener;
  import ch.qos.logback.core.status.StatusListener;
  import ch.qos.logback.core.status.StatusManager;
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertFalse;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  public class StatusListenerConfigHelperTest {
  
      Context context = new ContextBase();
      StatusManager sm = context.getStatusManager();
  
      @BeforeEach
      public void setUp() throws Exception {
      }
  
      @AfterEach
      public void tearDown() throws Exception {
      }
  
      @Test
      public void addOnConsoleListenerInstanceShouldNotStartSecondListener() {
          OnConsoleStatusListener ocl0 = new OnConsoleStatusListener();
          OnConsoleStatusListener ocl1 = new OnConsoleStatusListener();
  
          StatusListenerConfigHelper.addOnConsoleListenerInstance(context, ocl0);
          {
              List<StatusListener> listeners = sm.getCopyOfStatusListenerList();
              assertEquals(1, listeners.size());
              assertTrue(ocl0.isStarted());
          }
  
          // second listener should not have been started
          StatusListenerConfigHelper.addOnConsoleListenerInstance(context, ocl1);
          {
              List<StatusListener> listeners = sm.getCopyOfStatusListenerList();
              assertEquals(1, listeners.size());
              assertFalse(ocl1.isStarted());
          }
      }
  
  }